CN1088041A - Device and corresponding decoding device to the encoding digital signals of representing images - Google Patents

Device and corresponding decoding device to the encoding digital signals of representing images Download PDF

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Publication number
CN1088041A
CN1088041A CN93119569A CN93119569A CN1088041A CN 1088041 A CN1088041 A CN 1088041A CN 93119569 A CN93119569 A CN 93119569A CN 93119569 A CN93119569 A CN 93119569A CN 1088041 A CN1088041 A CN 1088041A
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circuit
discrete cosine
adder
output signal
inverse quantization
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CN1045147C (en
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E·费特
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Koninklijke Philips NV
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Philips Electronics NV
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/187—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being a scalable video layer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/124—Quantisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/146—Data rate or code amount at the encoder output
    • H04N19/152—Data rate or code amount at the encoder output by measuring the fullness of the transmission buffer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
    • H04N19/176—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a block, e.g. a macroblock
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
    • H04N19/61—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding in combination with predictive coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/146—Data rate or code amount at the encoder output
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/30—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using hierarchical techniques, e.g. scalability

Abstract

Be used for the device corresponding to the encoding digital signals that is subdivided into chunk is comprised first coding pass, prediction passage, and second coding pass.It is characterized in that predicting that passage also comprises: be used to quantize the described circuit output end of difference and the auxiliary branch between the described inverse discrete cosine transformation circuit, it comprises carries out the second circuit of inverse quantization and is used for second adder with the output signal addition of described first and second inverse quantization circuit the output signal of the described circuit that is used to quantize difference, and the output of described second adder is connected to the input of described inverse discrete cosine transformation circuit.

Description

Device and corresponding decoding device to the encoding digital signals of representing images
The present invention relates to device corresponding to the encoding digital signals of the image that is subdivided into chunk, this device is by constituting with the lower part: first coding pass, and it comprises discrete cosine conversion circuit, has the sample circuit of the first definite quantized level, the variable length code circuit, the buffer storage of the coded signal with definite quality-class time is provided and compares rate control circuit; The prediction passage, it is included in first inverse quantization circuit, inverse discrete cosine transformation circuit, first adder, graphic memory, the motion compensation stage of described sample circuit output place and is used for the subtraction circuit that the prediction output signal with described level deducts from the digital signal that will be encoded; And second coding pass, it comprises and is used for based on the downstream signal of discrete cosine conversion circuit and the circuit of calculated difference, is used to the circuit that utilizes second quantized level meticulousr than first quantized level to quantize the circuit of these differences and be used for the difference of such quantification is encoded.The present invention is particularly useful for having the inferior TV image of two image quality levels and distributes field and consistent with mpeg standard.
For in digital channel, transmitting image, when considering the situation of existing passage, must compressed package be contained in the information in these images.A large amount of coding techniquess is arranged for this reason, a wherein the most frequently used technology is to carry out continuous mathematic(al) manipulation according to discrete cosine transform (DCT), then the coefficient that is obtained by described conversion is quantized and the numerical value that quantized like this is carried out variable length code, this operation is predicted by picture motion and is finished.This of short duration prediction is based on and quantizes to realize, when coding, it do not represent represent the existing image of expression corresponding to the signal of each existing image and between preceding image the signal of difference, at this moment considered the motion between two images that separate with the time interval.
The device of this pattern is in U.S. Patent No. 4,958, is described in 226.Comprised that structure that the first original coding pass and being used for obtains the prediction passage of the first image quality level time also comprises the second channel in order to the value that is called residual error is encoded and tell from described first coding pass.Thereby this image decoded subsequently and storage has benefited from can be from the supplementary of the second image quality level time acquisition.
The purpose of this invention is to provide desirable code device, it is inferior to improve the second image quality level thus.
For this purpose, the present invention relates to the code device of description in first section, it is characterized in that predicting that passage also comprises: between the output and described inverse discrete cosine transformation circuit of the described circuit that is used to quantize difference, contain the auxiliary branch that the output signal of described quantification difference circuit is carried out the second circuit of inverse quantization, and being used for second adder with the output signal addition of described first and second inverse quantization circuit, described second adder output is connected to the input of described inverse discrete cosine transformation circuit.
Thereby the structure of being advised constitutes by the auxiliary feedback branch of design in encoder, this branch road extracts the informational content of being handled by second coding pass so that they are combined with (informational content) handled by the prediction passage, thereby has guaranteed prediction more accurately.
Another object of the present invention provides and is used for device that signal is decoded, and described signal is by means of the encoder apparatus of limiting structure and being encoded before this.
According to the present invention, this decoding device comprises with the lower part: first decoding channels, and it comprises the length-changeable decoding circuit that is connected in series, the 3rd inverse quantization circuit, the inverse discrete cosine transformation circuit of working according to described definite quantized level and the motion compensation stage that comprises movement compensating circuit; And the 3rd adder, its first input end receives the output signal of described inverse discrete cosine transformation circuit, and its second input receives the output signal of described movement compensating circuit, and the signal that it will be applied to the decoding of decoding device output offers the input of described movement compensating circuit by graphic memory, it is characterized in that it comprises with the lower part: second decoding channels, the 4th inverse quantization circuit that it comprises the second length-changeable decoding circuit that is connected in series, works according to the described quantized level meticulousr than the first order; And the 4th adder, two input receives the output signal of described third and fourth inverse quantization circuit, and its output signal adds to the input of described inverse discrete cosine transformation circuit.
These and other aspect of the present invention can be clearer by reference embodiment described below.
In the accompanying drawings:
Fig. 1 illustrates the embodiment according to code device of the present invention;
Fig. 2 illustrates the embodiment according to decoding device of the present invention.
Code device shown in Figure 1 comprises discrete cosine conversion circuit 10.This utilization has the conversion that the figure chunk of 8 * 8 pixel formats finishes and has guaranteed and will be transformed to 8 * coefficient chunk at its input (also corresponding to figure) received digital signal, first of this 8 * 8 chunk represented consider the grey level mean value of chunk pixel, and other 63 coefficients have been represented different spatial frequency in this chunk.
Sample circuit 20 is guaranteed circuit 10 above-mentioned output factors each is quantized.The coefficient positions of being considered in this quantification and 8 * 8 chunks relevant (high spatial frequency be lower than human eye the quantification of sentient frequency and corresponding coefficient can utilize the relatively largeization level that provides lower fine quantization and finish), this quantification is also relevant with the quantizing factor that depends on after this ratio of description.The quantized value of gained adds to variable length code circuit 30 subsequently, and its output is connected to buffer storage 40 to be used to store the word of compiling sign indicating number.Along with the operation of filling this memory 40, the ratio rate control circuit 50 that is located at output place of described memory adds to sample circuit 20 with above-mentioned quantizing factor, and quantized level can neither overflow also not empty relevant filling mode with described memory 40 by means of this factor values and revises.For example described a kind of like this coding strand that adopts ratio control in European patent application EP 0448491, this is not favourable in this case.The output signal of memory 40 is signals of crossing corresponding to the inferior coding of given quality-class, is designated as LQ among Fig. 1.
The quantized value of gained also is added to the prediction passage, and this prediction passage comprises: at first, and inverse quantization circuit 60.Appear at discrete cosine conversion circuit 10 output original coefficient and quantize after can be calculated by means of subtracter 105 by the difference between the same coefficient of inverse quantization at the output of circuit 60 subsequently.For meticulousr quantification with encode, these values that quantized, difference are added to second coding strand subsequently.With with the similar mode of previously described mode, this second coding strand comprise have than first sample circuit more the fine quantization level second sample circuit 115, be the second variable length code circuit 125 that its output is connected to buffer storage 135 thereafter.Along with the operation of filling this memory 135, second control circuit 145 adds to second sample circuit 115 with quantizing factor.As previously mentioned, this factor combines its effect and those effects of selecting quantized level, in order to guarantee the ratio control of memory 135.Because by the meticulousr additional quantization that circuit 115 is realized, the output signal of this memory 135 is encoded signals, and this coded signal is corresponding to the quality-class that is marked with HQ time, and this HQ quality-class time is higher than in the quality-class of first memory 40 outputs time.
According to the present invention, the coefficient that appears at inverse quantization circuit 60 outputs can calculate by means of adder 165 with the coefficient sum on the output that appears at second inverse quantization circuit 155 of being located at second sample circuit, 115 outputs.This and be added to the prediction passage, particularly the inverse discrete cosine transformation circuit 70, guaranteeing the inverse transformation to the conversion of being finished by circuit 10, that is according to the DCT coefficient, storage is corresponding to the digital signal of 8 * 8 pixel chunks.These signals add to the first input end of adder 85, and the output signal of adder 85 is stored in graphic memory 75.
The output signal of memory 75 adds to the motion compensation stage that comprises motion estimation circuit 80 and movement compensating circuit 90, and (be exactly this circuit 90, its first input end receives the output signal of described memory 75.）。Circuit 80 receives from the digital input signals of code device and determines displacement vector for each figure chunk, and this displacement vector is with respect to represent its motion (this determine to be known as chunk coordination) at the corresponding chunk of preceding image.The vector of Que Dinging adds to second input of movement compensating circuit 90 like this, and this circuit 90 provides the chunk of prediction, its be to determine in the subtracter 100 before discrete cosine conversion circuit 10 in the difference of preceding chunk.The chunk of this prediction also adds to second input of adder 85.
The first input end of subtracter 100 receives the output signal of format conversion circuit 95, and this circuit 95 receives from the digital input signals corresponding to the device of the figure that will occur with the chunk form at its output.Thereby, the digital signal that appears at circuit 10 inputs is not corresponding to the input signal of the code device of figure chunk subsequently, but represented the signal of difference between each original figure chunk and the prediction chunk, described prediction chunk is to deduce out from (original chunk) behind the complete operation in prediction passage (between the output of the input of inverse quantization circuit 60 and movement compensating circuit 90).
Under the situation that does not have unit 105 to 165, comprised that the passage of circuit 60,70,75,80,85,90 just constitutes common prediction passage.After having adopted the design of unit 105 to 165, on the basis of finishing the auxiliaring coding operation, can finish improved, meticulousr quantification, this makes in the better quality of encoded signals of memory 135 outputs, and has compared more accurate prediction with described common prediction.
The present invention is not limited to embodiment shown and that describe.The invention still further relates to decoding device, this decoding device is applicable to decoding in preceding encoded signals by means of device shown in Figure 1.
The embodiment of this decoding device is shown in Fig. 2.In this embodiment, this device has first decoding channels, the 3rd inverse quantization circuit 260, inverse discrete cosine transformation circuit 210 and motion compensation stage that it comprises the length-changeable decoding circuit 225 that is connected in series, works according to determined quantized level.This grade comprises as the movement compensating circuit 290 that information of forecasting is provided in coding work, and the 3rd adder 265, and two input receives the output signal of inverse quantization circuit and described movement compensating circuit.The decoded signal that this adder 265 will be applied to the decoding device output offers the input of described movement compensating circuit via graphic memory 275.This decoding device also has second decoding channels, the 4th inverse quantization circuit 355 and the 4th adder 365 that it comprises the second length-changeable decoding circuit 325 that is connected in series, works according to the quantized level meticulousr than the first order.Two inputs of this adder receive the output signal from described third and fourth inverse quantization circuit 260 and 355, and its output signal adds to the input of inverse discrete cosine transformation circuit 210.
In this decoding device, first decoding channels receives the corresponding inferior coded signal of definite quality-class that is marked with LQ before this, and second decoding channels receives the inferior coded signal of improvement quality-class that is marked with HQ accordingly before this.Thereby the addition of decoded information composition provides the possibility of rebuilding the figure with this improved quality-class time at the output of decoding device in each of two passages.No matter be what reason, if only receive coded signal LQ, this signal has added the protection level that increases in transport process, and then second decoding channels can become by means of switch 390 shown in dotted lines in Figure 2 and do not work.Fig. 2 is with shown in the universal circuit diagram form of the decoding channels that adopt to receive single described coded signal LQ, and the reconstruction figure with the inferior LQ of described really quality-class only is provided.

Claims (3)

1, is used for device corresponding to the encoding digital signals that is subdivided into chunk, this device is by constituting with the lower part: first coding pass, and it comprises discrete cosine conversion circuit, has the sample circuit of the first definite quantized level, the variable length code circuit, the buffer storage of the coded signal with definite quality-class time is provided and compares rate control circuit; The prediction passage, it comprises first inverse quantization circuit, inverse discrete cosine transformation circuit, first adder, graphic memory, the motion compensation stage that is arranged in described sample circuit output and is used for deducting from the described signal that will encode the subtracter of the prediction output signal of described level; And second coding pass, the circuit that it comprises the circuit that is used for calculated difference on the signal downlink basis of discrete cosine conversion circuit, adopt the circuit that these differences is quantized than the meticulousr quantized level of the first order and be used for the difference of quantification like this is encoded; It is characterized in that predicting that passage also comprises: be used to quantize the described circuit output end of difference and the auxiliary branch between the described inverse discrete cosine transformation circuit, it comprises carries out the second circuit of inverse quantization and is used for second adder with the output signal addition of described first and second inverse quantization circuit the output signal of the described circuit that is used to quantize difference, and the output of described second adder is connected to the input of described inverse discrete cosine transformation circuit.
2, be used for the device of decoding in preceding encoded signals to by means of code device as claimed in claim 1, this device is by constituting with the lower part: first decoding channels, and it comprises the length-changeable decoding circuit that is connected in series, the 3rd inverse quantization circuit, the anti-discrete surplus translation circuit of working according to described definite quantized level and the motion compensation stage that has comprised movement compensating circuit; And the 3rd adder, its first input end receives the output signal of described inverse discrete cosine transformation circuit, and its second input receives the output signal of described movement compensating circuit, and the decoded signal that will be applied to the decoding device output is delivered to the input of described movement compensating circuit via graphic memory; It is characterized in that it comprises second decoding channels, the 4th inverse quantization circuit and the 4th adder that it comprises the second length-changeable decoding circuit that is connected in series, works according to the described quantized level meticulousr than the first order, two input receives the output signal of described third and fourth inverse quantization circuit, and its output signal adds to the input of described inverse discrete cosine transformation circuit.
3, decoding device according to claim 2 is characterized in that second decoding channels comprises that being used to of being connected in series close the idle worker of described second channel, and this switch is located between the 4th inverse quantization circuit and the 4th adder.
CN93119569A 1992-10-28 1993-10-25 Device for encoding digital signals representing images and corresponding decoding device Expired - Lifetime CN1045147C (en)

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FR9212880A FR2697393A1 (en) 1992-10-28 1992-10-28 Device for coding digital signals representative of images, and corresponding decoding device.
FR9212880 1992-10-28

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CN1059771C (en) * 1995-01-12 2000-12-20 华邦电子股份有限公司 Digital image decoder and decoding method
CN100350801C (en) * 2001-03-29 2007-11-21 尼克斯特里姆股份有限公司 Method and equipment for controlling video frequency data quality
CN1640145B (en) * 2002-03-04 2010-09-08 皇家飞利浦电子股份有限公司 Video frequency coding method and device, data stream decoding method and device
CN100337467C (en) * 2003-10-06 2007-09-12 三星电子株式会社 Image processing apparatus and method of using the same
US7912122B2 (en) 2004-01-20 2011-03-22 Panasonic Corporation Picture coding method, picture decoding method, picture coding apparatus, picture decoding apparatus

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US5500677A (en) 1996-03-19
CA2109138A1 (en) 1994-04-29

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